The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 1982
Filed:
Apr. 23, 1980
Applicant:
Inventor:
Frank L Simokat, Babylon, NY (US);
Assignee:
TII Industries, Inc., Copiague, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ; H04M / ;
U.S. Cl.
CPC ...
179 / ; 179 / ;
Abstract
A telephone ringer isolator includes an electronic switch which enables it to operate at reduced ringer voltages. In the ringer isolator, the central office ringing signal is rectified and voltage doubled across a circuit containing two diodes and two capacitors. The second capacitor is connected across a neon tube. When the voltage across the second capacitor rises to a preselected value, the neon tube is fired to emit light onto a light sensitive resistor which feeds gate current to a Triac to turn the Triac on. The Triac, in turn, grounds the telephone ringer.